Periodic Boundary Contitions
Periodic Boundary Contitions
(OP)
Hi all,
I'm trying to simulate the behaviour of and unit cell of bi-metal (metal substrate with a film of other metal) against thermal strain. I wanna to use Periodic Boundary Conditions to have a discret volum of control (using a *EQUATION Interaction Module) but I haven't been able to apply this.
ABAQUS always returns a message error about that the DOF it's not possible to be constrained because it's not active in the model. What type of element I have to use? Is it possible to apply via kernel or I need to edit the inp file?
Thanks!
I'm trying to simulate the behaviour of and unit cell of bi-metal (metal substrate with a film of other metal) against thermal strain. I wanna to use Periodic Boundary Conditions to have a discret volum of control (using a *EQUATION Interaction Module) but I haven't been able to apply this.
ABAQUS always returns a message error about that the DOF it's not possible to be constrained because it's not active in the model. What type of element I have to use? Is it possible to apply via kernel or I need to edit the inp file?
Thanks!





RE: Periodic Boundary Contitions
corus
RE: Periodic Boundary Contitions
About the elements, I use the standard solid stress element (no reduced integration) that you can select via the kernel, but this ones have a only 1,2,3 DOF active... The problem is that I need to use several MPC (*EQUATION BC) for apply a Periodic Boundary Condition (defining the displacements & rotations of the unit cell faces symmetrical over middle planes) and I need that the 4,5,6 DOF to be active...
omoya
RE: Periodic Boundary Contitions
Other than that I don't know what is meant by a 'periodic boundary condition', even after checking the manuals so can't answer your question any better.
corus
RE: Periodic Boundary Contitions
I'll try modeling the thin film material as you says.
Thanks a lot!
RE: Periodic Boundary Contitions
If by "Periodic Boundary Condition" you mean you want your modelled segment of the bi-layer to behave as if it were a part of a much greater semi-infinite or infinite medium, then you may want to apply a combination of symmetry boundary conditions and coupling such that all planes remain plane during the analysis. To do this you will only model half the unit cell with appropriate symmetry boundary conditions, and all other remaininng surfaces will be coupled in the direction normal to those surfaces. To do this, for each surface, create an assembly reference point, and apply a surface based kinematic coupling constraint on those surfaces with the constrained degree of freedom corresponding to the direction of the surface normal.
bfillery
RE: Periodic Boundary Contitions
I proposed to the tutor of the project to do this with axisymmetric shell elements and in the boundary put in infinite element CINAX4 (may be another way to do the same) but he impose the using of PBC.
Thank you to explain how I can apply this method.
RE: Periodic Boundary Contitions
corus
RE: Periodic Boundary Contitions